XMP Help

[Sniper_3001]

Hi guys. So I managed to get a stable 5.1GHz OC at 1.38v with an AVX offset of 1 (temps are around 55-60 at 100% CPU usage at 2hours). Ran both prime95 and realbench for 2 hours and no issues. The problem I'm having though is with XMP. When I turn on XMP and set it to 3866MHz.....it passes Prime95 no problem but fails Realbench after about 10 minutes (I get a blue screen of death with a computer restart). The ram I have is GSkill Trident Z RGB 4133mhz. The only way I can get the computer to boot up at 3866 is if I increase the DRAM Voltage to 1.4, VCCIO to 1.2, CPU System Agent to 1.225 (I have no idea about these values but I saw a video on youtube that said to use these), Dram Timings are all set to Auto and Mode 2. The timings I see from CPU-Z are CL-17, tRCD-25, tRP-25, tRAS-45, tRFC-535, CR-2T. I also tried to turn down the ram speed to 3733MHz keeping everything the same but exactly the same result....fails in Realbench. The timing I get from 3733mhz is CL-15, tRCD-15, tRP-15, tRAS-36, tRFC-654, CR-2T. Do you guys have any ideas what i'm doing wrong or is my memory MHz too high? How do I figure out what VCCIO voltage to use or System Agent voltage to use? I'm so lost.

[Sniper_3001]

Zka17 wrote:
Just to understand correctly: Slots 3&4 post both default and XMP and Slots 1&2 only default, no XMP? With the same stick?

Exactly. It's one stick. When I put both in 1&3 or 2&4 XMP does not work. *Only default. *But with 1 stick slots 3 or 4 work at 4000mhz XMP and passes real bench. * I also switched memory sticks and same results was found. 1 & 2 will not post for anything over 3600 XMP. Which I guess is fine but even at 3600mhz my computer crashes BSOD or will not pass realbench. I'm also not willing to go lower than that. I'm guessing the motherboard has problems.

[Zka17]

Hm... interesting...

This is what I would do before blaming on the board:
1. Make sure that the sticks are in the DIMMs recommended by the manual (A1 & B1).
2. Restore BIOS to default.
3. Test the memories: link in my #6 post. If all OK, then your hardware is working properly...
4. Raise the memory speed to where it was still booting; do memory testing again... if fails: adjust timings and voltages - manually; if still fails, I would suspect a weak IMC...
5. Just to make sure that the BIOS did not get corrupted, you could re-flash it with the newest one - then repeat all above...

[Menthol]

Other possibilities could be bent socket pins, uneven or over tightening of heatsink/block can cause these issues
For testing purposes, leave VCCIO and VCCSA on auto and use software to read these voltages before making adjustments
on my APEX when I set XMP using 4226 modules the bios sets these to approx. 1.32 volts, while this may seem high I believe it is acceptable for the highest frequency memory on the market

IX Code memory QVL list from ASUS website , is your memory kit on the list? looks like all 4133 kits are 32GB 4X8 module kits

[Menthol]

Other possibilities could be bent socket pins, uneven or over tightening of heatsink/block can cause these issues
For testing purposes, leave VCCIO and VCCSA on auto and use software to read these voltages before making adjustments
on my APEX when I set XMP using 4226 modules the bios sets these to approx. 1.32 volts, while this may seem high I believe it is acceptable for the highest frequency memory on the market

IX Code memory QVL list from ASUS website , is your memory kit on the list? looks like all 4133 kits are 32GB 4X8 module kits